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A. L. PAROEL'LB.

ELECTRIC PEND ULUM CLOCK.

No. 410,013. Patented Aug. 27, 1889.

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(No Model.) 2 Sheets-Sheet 2. A. L. PARGELLE.

ELECTRIC PENDULUM CLOCK.

No. 410,013. Patented Aug. 27, 1889.

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UNITED STATES PATENT OFFICE.

ALBERT L. PARGELLE, OF NEV YORK, N. Y.

ELECTRIC PENDULUM CLOCK.

SPECIFICATION forming part of Letters Patent No. 410,013, dated August 27, 1889.

Application filed April 2'7, 1888. Renewed July 18,1889. Serial No. 317,858. (No model.)

To all whom it may concern:

Be itknown that I, ALBERT LYMAN PAR- CELLE, a citizen of the United States, of Boston, hllassachusetts, now residing in New York, county and State of New York, have invented certain new and useful Improvements in Electric Clocks, of which the following is a specification.

The object of the invention is to provide a new arrangement of switch actuated by the pendulum to control the circuit of such charactor that uniform contacts are maintained and wear of parts diminished and compensated, and to provide a clock actuated by an elect-rically-driven pendulum with a sweep seconds-hand.

In the accompanying drawings, Figure 1 is a front elevation of so much of a pendulum clock mechanism as is necessary to illustrate the invention; Fig. 2, a side elevation of the same, partly in section; and Fig. 3, a detail sectional view on line 3 3 of Fig. 1.

A represents the back board or supportingframe carrying the clock-train B, pendulum O, and switch devices D. The pendulum, which is preferably a resilient vibrator held rigidly or clamped in a block 0, is to be driven by an electro-magnet whose coil is connected in a circuit controlled by the switch devices D. Adjustable screws on the pivoted switch D embrace the pendulum, so that the switch is rocked at each vibration and the circuit of the pendulum-driving magnet intermittently completed through the central contact on the face of the switch and the pivoted brush 1) bearing thereon. One pole of the battery is to be connected with the brush and the opposite pole connected, through the pendulum-driving magnet, with the central contact above mentioned, and by a branch circuit through a resistance with the two outer contacts on the switch.

00 represents the wire connected with the central contact, 3 that connected with the outside or resistance contacts, and 2 that connected with the pivoted brush D Such an arrangement of circuits, switch, and contacts and switch-brush is shown, described, and claimed in my patent, No. 38%,271, granted June 12, 1888, to which reference is made for further particulars.

In practice much care is required to insure a perfectly-uniform contact between the brush and the face of the switch. If the pivot of the brush is not placed in the proper relation to the face of the switch, one portion or edge only of the brush may bear upon the switch, thus giving an imperfect contact and causing unequal wear. In use also, even if the switch and brush are properly related, the contactsurfaces are liable to become impaired, either by reason of unequal wearing of parts of the brush or switch or of the brush-bearing.

XVhether the brush be a pivoted one, such as shown, or not, it should be capable of rocking transversely to accommodate itself readily to the face of the switch. By thus constructing the brush special care in making and mounting it and its bearing-pin is avoided and the surfaces of contact will not vary in use.

One practical manner of mountingthe brush is illustrated in the drawings. It is cut out on top for the reception of the bearing-pin d, and is pivotallyhung thereon by atransverse pin (1'. Sufficient play being allowed, it will rock transversely to accommodate itself to the face of the switch. This structure is simple, practical, and efiicient.

The time of operation of the switch by the pendulum may be regulated by the adjustable screws between which the pendulum works; but as they are more or less difficult of access I also provide the following arrangement, which may be used in conjunction with the pendulum-embracing screws. The block E, carrying the brush, is capable of rocking on its supporting-bolt E, and may be moved back and forth to vary the relation of the brush to the switch by means of a thumb-bolt e, passing through a lug e on the frame and working in a screw-threaded nut 6 loosely seated in a socket in the top of the block.

The clock-train is actuated by a depending lever B, whose lower forked end embraces the pendulum and whose upper end "is attached to a rock-shaftl), carrying an endwiseadjustable rod 1'), which engages a rocking notched lever B having gravity-pawls 1) b The pawls drive a train-driving wheel XV at each vibration, and, as will be plain from an inspection of the drawings, each pawl acts upon each tooth as follows: Each time that the left-hand side of the lever B is depressed the left-hand pawl 11 moves the wheel \V and to act upon it when the left-hand side of the lever is depressed, and each time that the latter movement takes place a new tooth of the wheel is brought under the left-hand pawl b The operation is analogous to the double beats of the pallets upon each escapementwheel tooth in an ordinary clock. There being thirty teeth in the wheel W, it will therefore receive sixty impulses in each revolution. The spindle of the wheel extends in front of the clock-face (not shown in drawings) and carries a sweep seconds-hand S, as clearly seen in Fig. 2. The minute-hand M is driven in proper time by the gears M M M M and the hour-hand H by the gears H H H H The construction and operation are plain from the drawings, and do not require detailed description.

As above remarked, I prefer to employ a resilient pendulum, such as shown in my patent of April 12, 1887, because it is isochronous and has other desirable functions, as fully set forth in said patent.

I claim as my invention 1. In an electrically-driven clock, the combination of a pendulum-moving switch having contacts thereon and the transverselyrocking brush bearing on the switch, substantially as set forth.

2. The combination of the pendulum, the pivoted rocking switch, and the pivoted and transversely-rocking brush bearing thereon,

substantially as set forth.

3. The combination of the pendulum, the switch operated thereby and carrying adj ustable screws embracing the pendulum, the

pivoted brush, its pivoted supporting-block,

and the adjusting-screw for rocking the block, substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

ALBERT L. PAROELLE.

\Vitnesses:

T. F. HASCALL, H. W. VANDER POEL. 

